JP4147695B2 - Polyphenylene sulfide short fiber - Google Patents

Description

【０００７】
ただし、Ｒ₁は炭素数１０〜１４の脂肪族炭化水素基、ｌ, ｍはオキシエチレン基の付加モル数をそれぞれ示し、ｌ＋ｍ＝５〜１５である。
【０００８】
【化４】

【０００９】
ただし、Ｒ₂は炭素数８〜１０の脂肪族炭化水素基、ｎはオキシエチレン基の付加モル数をそれぞれ示し、ｎ＝５〜１０である。
【００１０】
【発明の実施の形態】
本発明において用いられる油剤は、（ａ）〜（ｄ）の成分を特定の割合で配合したものであり、さらに必要に応じて、抗菌剤、消臭剤、難燃剤などを配合し、低粘度鉱物油などで希釈したストレート型（非水油系）あるいは水溶性エマルジョン型のものである。以下、（ａ）〜（ｄ）の成分について詳細に説明する。
【００１１】
（ａ）成分は、炭素数が１６〜２２の飽和脂肪族炭化水素基を有する燐酸エステルカリウムであって、主に短繊維の平滑性を高める作用を有するものであり、特に、ステアリルホスフェートカリウム（Ｃ₁₈）、セチルホスフェートカリウム（Ｃ₁₆）が好ましい。飽和脂肪族炭化水素基の炭素数が１６より小さいと、この成分の脱落が起こり易くなりローラー巻き付きが起こるので好ましくない。一方、炭素数が２２を越えると、制電性が悪化するので好ましくない。また、この成分の全油剤に占める配合比率は５０〜７０重量％であり、５０重量％未満であると平滑性および制電性が損なわれ、逆に７０重量％を越えると糸やスライバーの集束性が不足し、スライバーのコイリング不良やローラー巻き付きが起こり、スカムの堆積が多くなるので好ましくない。
【００１２】
（ｂ）成分は、好ましくは融点が４０〜８０℃のパラフィンワックスであり、スカムを少なくし、（ａ）成分の作用をさらに助長するものである。また、この成分の全油剤に占める配合比率は１０〜２０重量％であり、１０重量％未満であるとスカム防止効果が不十分となり、逆に２０重量％を越えるとワックスの離型効果が増大し、繊維絡合性が不十分となりローラー巻き付きが起こるので好ましくない。
【００１３】
（ｃ）成分は、主に（ａ）成分と（ｂ）成分の併用による制電性不足を補う作用を有し、帯電防止能を有するカチオン界面活性剤および／またはアニオン界面活性剤であり、特に、カチオン界面活性剤としては第４級アンモニウム塩型、アミド型、スルホニウム型が、またアニオン界面活性剤としてはポリオキシエチレン燐酸エステル塩、ポリオキシエチレンサルフェート塩がそれぞれ好ましい。この成分の全油剤に占める配合比率は１０〜１５重量％であり、１０重量％未満であると十分な静電気抑制効果が得られず、逆に１５重量％を越えると（ａ）および（ｂ）成分の割合が相対的に少なくなり、平滑性やスカム防止効果が低下するので好ましくない。
【００１４】
（ｄ）成分は、（ｃ）成分の作用をさらに助長するものであり、一般式［I］、［II］で示され、特にポリエチレンオキサイドアミノエーテル、ポリエチレンオキサイドノニルフェノールエーテルを用いるのが好ましい。この成分の全油剤に占める配合比率は４〜１５重量％であり、４重量％未満であると低湿時の制電性に欠け、逆に１５重量％を越えると（ａ）〜（ｃ）成分の割合が相対的に少なくなり、平滑性、制電性やスカム防止効果が低下するので好ましくない。
【００１５】
本発明にかかる上述した油剤のＰＰＳ短繊維への付着量は、繊維重量対比０．０１〜１０重量％が好ましく、０．１〜１重量％がより好ましい。
【００１６】
本発明におけるポリフェニレンサルファイドとは、ポリマの繰り返し単位の９０％以上が一般式［III］で構成されたポリマであるが、１０％未満の一般式［IV］で表される繰り返し単位を含んでもよい。
【００１７】
【化５】

【００１８】
【化６】

【００１９】
本発明のＰＰＳ短繊維は、上述したポリマを用いて溶融紡糸を行い、得られた未延伸糸を所望の太さに収縮し、延伸工程、捲縮付与工程を経て、所望の長さにカットすることにより製造される。単繊維繊度およびカット長については特に限られているわけではないが、単繊維繊度０．１〜１００デニール、カット長１〜１０００ｍｍの短繊維が好ましく、単繊維繊度０．５〜３０デニール、カット長１０〜１００ｍｍの紡績糸用に良好に用いられ得るものがさらに好ましい。
【００２０】
本発明における油剤はこれらの工程の任意の段階で付与できるが、延伸終了後の捲縮付与を行う前あるいは捲縮付与後にカットする前の段階で付与するのが好ましい。
【００２１】
また、本発明の油剤を用いたＰＰＳ短繊維において、さらに十分な繊維絡合性や糸およびスライバーの集束性を得るために、本発明におけるＰＰＳ短繊維の捲縮度は１０〜２３％が好ましく、１３〜２０％がより好ましい。１０％未満であると繊維絡合性が不十分となってローラー巻き付きが起こり、逆に２３％を越えるとネップが発生し品質悪化を招くので好ましくない。
【００２２】
また、本発明におけるＰＰＳ短繊維の捲縮数は６〜１８山/２５mmが好ましく、９〜１５山/２５mmがより好ましい。６山/２５mm未満であると繊維絡合性が不十分となってローラー巻き付きが起こり、逆に１８山/２５mmを越えるとネップが発生し品質悪化を招くので好ましくない。なお、本発明にかかる上述した油剤をＰＰＳ短繊維に付与することにより、上述した捲縮度および捲縮数を容易にかつ安定的に得ることができる。
【００２３】
【実施例】
以下、実施例により本発明をさらに詳細に説明する。なお、本例中における測定法は以下の通りである。
（１）捲縮数および捲縮度
試料を縮分しチップ状部分からランダムに短繊維を抜き取り、この短繊維の片側の山数を拡大鏡を用いて１０回読み取り、その平均値を短繊維１本当たりの片側の山数とする。次にこの短繊維の一端を固定し、他端に２mg/dおよび３００mg/dの荷重をかけ、そのときの繊維長をそれぞれ測定し、次式により捲縮数および捲縮度を算出する。
捲縮数[山/２５mm]＝２５ａ/Ａ
捲縮度[％]＝１００(Ｂ−Ａ)/Ｂ
ただし、ａ、Ａ、Ｂについては、以下に示すものとする。
ａ：短繊維１本当たりの片側山数
Ａ：２mg/dの荷重をかけたときの繊維長[mm]
Ｂ：３００mg/dの荷重をかけたときの繊維長[mm]
（２）繊維金属間および繊維間動摩擦係数
試料をハンドカードでよく開繊して２デニールの均等なスライバーにする。次に該試料から所望の１本の繊維を採取し、その両端に適当な初荷重を取り付けたものをレーダー式摩擦係数試験機の金属製円筒（外径８mm）の中央にかけ、その一端をトーションバランスのフックに接続する。繊維金属間動摩擦係数（以下、FMμdという）の測定には、この金属製円筒を周速度９０cm/分で回転させ、トーションバランスにより繊維両端のバランスがとれる荷重を求め、次式により摩擦係数を算出する。繊維間動摩擦係数（以下、FFμdという）の測定には、繊維が金属製円筒の軸方向と平行になるように巻き付けた円筒を用いてFMμdと同様に行う。なお、測定は温度２０℃、相対湿度６５％の条件下において行う。
動摩擦係数（FMμdまたはFFμd）＝０．７３３ｌｏｇ[Ｗ/(Ｗ−ｍ)]
ただし、Ｗ、ｍについては、以下に示すものとする。
Ｗ：繊維の両端にかけた初荷重［mgfまたはＮ］
ｍ：トーショントラバースの読み［mgfまたはＮ］
（３）制電性
温度３０℃、相対湿度４０％の条件下でのカード工程において、ウェブ上１０ｃｍの帯電電位［ｍＶ］を測定し、帯電し難い順に以下の３段階で評価した。
１．良好：-500mV以上0mV以下
２．やや不良：-1000mV以上-500mV未満
３．不良：-1000mV未満
（４）ネップの有無
温度３０℃、相対湿度４０％の条件下でのカード工程において、ウェブ中の繊維のもつれ合った小塊（ネップ）の有無を目視により測定し、小塊の少ない順に以下の４段階で評価した。
１．極めて良好
２．良好
３．やや不良
４．不良
（５）スカムの付着状態
温度２５℃、相対湿度６５％の条件下での練条工程において、紡出３００ゲレン／６ヤードのカードスライバーを８０ｋｇ通し、ゴムローラーへの脱落物を集めて測定し、その重量［ｍｇ］の少ない順に以下の４段階で評価した。
１．極めて良好：100mg未満
２．良好：100mg以上200mg未満
３．やや不良：200mg以上300mg未満
４．不良：300mg以上
（６）ケンス収容量
温度２５℃、相対湿度６５％の条件下での練条工程において、紡出３００ゲレン／６ヤードのカードスライバーを練条機に通したときにケンスに収容した練条スライバー長［yard］を測定し、その長さの多い順に以下の４段階で評価した。
１．極めて良好：1200yard以上
２．良好：1100yard以上1200yard未満
３．やや不良：1000yard以上1100yard未満
４．不良：1000yard未満
（７）巻き上がり綿量
温度２５℃、相対湿度６５％の条件下での練条工程において、紡出３００ゲレン／６ヤードのカードスライバー１０ｋｇを練条機に通したときにドラフトローラー上部に巻き上がった綿量［ｍｇ］を測定し、その量の少ない順に４段階で評価した。
１．極めて良好：100mg未満
２．良好：100mg以上200mg未満
３．やや不良：200mg以上300mg未満
４．不良：300mg以上
（８）ローラー巻き付き
温度２５℃、相対湿度６５％の条件下での粗紡工程（６０錘）において、練条スライバー１．５トンを粗紡機に通したときにゴムローラーに巻き付いた回数[回/1.5トン]を測定し、その回数の少ない順に以下の４段階で評価した。
１．極めて良好：1回未満
２．良好：1回以上3回未満
３．やや不良：3回以上10回未満
４．不良：10回以上
実施例１〜５、比較例１〜６
ＰＰＳトウ（単繊維繊度：２デニール）に表１に示す捲縮度および捲縮数を付与した後、表１に示す油剤をスプレー方式により繊維に対して０．２重量％付与し、５１mmにカットしてＰＰＳ短繊維を得た。このＰＰＳ短繊維を混打綿、カード、練条の各工程に通し、捲縮数および捲縮度、繊維金属間および繊維間動摩擦係数、制電性、ネップの有無、スカムの付着状態、ローラー巻き付き、ケンス収容量および巻き上がり綿量を測定した。その結果を表２に示す。
【００２４】
その結果、本発明のＰＰＳ短繊維はいずれもローラー巻き付き、スカムおよびネップの発生、スライバーコイリング不良などを起こすことなく良好な紡績性をを有していたが、比較例のＰＰＳ短繊維は紡績性の悪いものであった。
【００２５】
【表１】

【００２６】
【表２】

【００２７】
【発明の効果】
本発明により、高品質で良好な紡績性を有するＰＰＳ短繊維を提供することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a polyphenylene sulfide (hereinafter referred to as PPS) short fiber having high quality and good spinnability.
[0002]
[Prior art]
PPS short fibers are mainly used as felt because of their excellent chemical resistance, particularly acid resistance and heat resistance. However, PPS short fibers have the disadvantage that they are slippery and difficult to spin because of low friction between fibers. Therefore, Japanese Patent Laid-Open No. 4-202819 proposes a PPS short fiber with improved spinnability by imparting a lower alkyl phosphate ester salt such as lauryl phosphate potassium to increase the inter-fiber and inter-fiber metal friction coefficient to some extent. Has been.
[0003]
However, there is a limit to increasing the coefficient of dynamic friction between fibers and fibers and metals with the above oil agent, and during the long-term operation, the adhesive deposit (hereinafter referred to as scum) of the oil agent on the metal part and the roller part in each spinning process There was a problem that sliver coiling failure due to irregular drafts, roller winding and thread breakage occurred, and operability and quality deteriorated remarkably. That is, if the alkyl group of the alkyl phosphate ester salt is made lower, the coefficient of friction increases, but there is a problem that the spinnability is remarkably deteriorated due to the generation of a large amount of scum. On the contrary, if the alkyl group is made higher grade, the occurrence of scum can be suppressed, but there is a problem that the spinnability is remarkably deteriorated due to the reduction of the friction coefficient.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to provide a short PPS fiber which can solve the above-mentioned drawbacks and can be spun with high quality and good operability.
[0005]
[Means for Solving the Problems]
The PPS short fiber of the present invention that achieves the above-described object comprises (a) 50 to 70% by weight of a phosphate ester potassium salt having a saturated aliphatic hydrocarbon group having an average carbon number of 16 to 22, and (b) 10 to 10 paraffin wax. 20% by weight, (c) 10 to 15% by weight of a cationic surfactant and / or anionic surfactant, (d) from 4 to 15% by weight of the component represented by the general formula [I] and / or [II] It is a PPS short fiber characterized in that the oil agent is applied to the fiber.
[0006]
[Chemical 3]

[0007]
Here, R ₁ represents an aliphatic hydrocarbon group having 10 to 14 carbon atoms, l and m represent the number of added moles of an oxyethylene group, and l + m = 5 to 15.
[0008]
[Formula 4]

[0009]
However, R ₂ is an aliphatic hydrocarbon group having 8 to 10 carbon atoms, n represents respectively the molar number of addition of oxyethylene group, an n = 5 to 10.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The oil used in the present invention is a mixture of the components (a) to (d) at a specific ratio, and if necessary, an antibacterial agent, a deodorant, a flame retardant, etc., and a low viscosity. Straight type (non-water oil type) diluted with mineral oil or water-soluble emulsion type. Hereinafter, the components (a) to (d) will be described in detail.
[0011]
The component (a) is potassium phosphate ester having a saturated aliphatic hydrocarbon group having 16 to 22 carbon atoms, and mainly has an effect of enhancing the smoothness of short fibers. In particular, stearyl phosphate potassium ( C ₁₈ ) and potassium cetyl phosphate (C ₁₆ ) are preferred. If the saturated aliphatic hydrocarbon group has a carbon number of less than 16, this component is liable to fall off and roll wrapping is undesirable. On the other hand, if the number of carbon atoms exceeds 22, the antistatic property deteriorates, which is not preferable. Further, the blending ratio of this component to the total oil agent is 50 to 70% by weight, and if it is less than 50% by weight, smoothness and antistatic properties are impaired, and conversely if it exceeds 70% by weight, the thread and sliver are concentrated. It is not preferable because the sliver is insufficient, the coiling of the sliver is poor, the roller is wound, and the scum is accumulated.
[0012]
The component (b) is preferably a paraffin wax having a melting point of 40 to 80 ° C., reduces scum, and further promotes the action of the component (a). The blending ratio of this component to the total oil is 10 to 20% by weight, and if it is less than 10% by weight, the effect of preventing scum is insufficient. Conversely, if it exceeds 20% by weight, the effect of releasing the wax increases. In addition, the fiber entanglement becomes insufficient, and the roller winding occurs, which is not preferable.
[0013]
The component (c) is a cationic surfactant and / or an anionic surfactant that mainly has an action to compensate for the lack of antistatic properties due to the combined use of the component (a) and the component (b), and has an antistatic ability. In particular, the quaternary ammonium salt type, the amide type, and the sulfonium type are preferable as the cationic surfactant, and the polyoxyethylene phosphate salt and the polyoxyethylene sulfate salt are preferable as the anionic surfactant, respectively. The blending ratio of this component in the total oil agent is 10 to 15% by weight, and if it is less than 10% by weight, a sufficient antistatic effect cannot be obtained, and conversely if it exceeds 15% by weight, (a) and (b) Since the ratio of a component becomes relatively small and smoothness and a scum prevention effect fall, it is not preferable.
[0014]
The component (d) further promotes the action of the component (c) and is represented by the general formulas [I] and [II], and it is particularly preferable to use polyethylene oxide amino ether or polyethylene oxide nonyl phenol ether. The blending ratio of this component in the total oil agent is 4 to 15% by weight. If it is less than 4% by weight, the antistatic property at low humidity is lacking. Conversely, if it exceeds 15% by weight, the components (a) to (c) This ratio is relatively unfavorable, and the smoothness, antistatic property and scum prevention effect are reduced, which is not preferable.
[0015]
The amount of the oil according to the present invention attached to the PPS short fibers is preferably 0.01 to 10% by weight, more preferably 0.1 to 1% by weight relative to the fiber weight.
[0016]
The polyphenylene sulfide in the present invention is a polymer in which 90% or more of the repeating units of the polymer are constituted by the general formula [III], but may contain less than 10% of the repeating units represented by the general formula [IV]. .
[0017]
[Chemical formula 5]

[0018]
[Chemical 6]

[0019]
The PPS short fiber of the present invention is melt-spun using the above-described polymer, the obtained undrawn yarn is shrunk to a desired thickness, and is cut to a desired length through a stretching process and a crimping process. It is manufactured by doing. Although the single fiber fineness and the cut length are not particularly limited, short fibers having a single fiber fineness of 0.1 to 100 denier and a cut length of 1 to 1000 mm are preferable, and a single fiber fineness of 0.5 to 30 denier and cut What can be used favorably for spun yarn having a length of 10 to 100 mm is more preferable.
[0020]
The oil agent in the present invention can be applied at any stage of these steps, but it is preferable to apply it before performing crimp application after stretching or before cutting after applying crimp.
[0021]
Further, in the PPS short fiber using the oil agent of the present invention, in order to obtain sufficient fiber entanglement property and yarn and sliver convergence, the crimp degree of the PPS short fiber in the present invention is preferably 10 to 23%. 13 to 20% is more preferable. If it is less than 10%, the fiber entanglement becomes insufficient and roller winding occurs, and conversely if it exceeds 23%, nep is generated and quality is deteriorated, which is not preferable.
[0022]
Further, the number of crimps of the PPS short fibers in the present invention is preferably 6 to 18 crests / 25 mm, more preferably 9 to 15 crests / 25 mm. If it is less than 6 ridges / 25 mm, the fiber entanglement will be insufficient, and roller winding will occur. Conversely, if it exceeds 18 ridges / 25 mm, nep will occur and quality will be deteriorated. In addition, the above-mentioned crimping degree and the number of crimps can be obtained easily and stably by providing the oil agent mentioned above concerning this invention to a PPS short fiber.
[0023]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples. In addition, the measuring method in this example is as follows.
(1) The number of crimps and the degree of crimp are shrunk, short fibers are randomly extracted from the chip-like portion, the number of peaks on one side of the short fibers is read 10 times with a magnifying glass, and the average value is obtained as a short fiber The number of hills on one side per piece. Next, one end of this short fiber is fixed, a load of 2 mg / d and 300 mg / d is applied to the other end, the fiber lengths at that time are measured, and the number of crimps and the degree of crimp are calculated by the following equations.
Number of crimps [mountain / 25mm] = 25a / A
Crimp degree [%] = 100 (B−A) / B
However, a, A, and B are shown below.
a: Number of threads on one side per short fiber A: Fiber length when a load of 2 mg / d is applied [mm]
B: Fiber length when a load of 300 mg / d is applied [mm]
(2) The fiber metal-to-fiber and inter-fiber dynamic friction coefficient samples are well opened with a hand card to make a 2-denier uniform sliver. Next, a desired single fiber is sampled from the sample, and an appropriate initial load is attached to both ends of the sample and applied to the center of a metal cylinder (outer diameter 8 mm) of a radar friction coefficient tester. Connect to the balance hook. To measure the dynamic friction coefficient between fibers and metal (hereinafter referred to as FMμd), this metal cylinder is rotated at a peripheral speed of 90 cm / min, the load that balances both ends of the fiber is obtained by torsion balance, and the friction coefficient is calculated by the following formula: To do. The inter-fiber dynamic friction coefficient (hereinafter referred to as FFμd) is measured in the same manner as FMμd using a cylinder wound so that the fiber is parallel to the axial direction of the metal cylinder. The measurement is performed under conditions of a temperature of 20 ° C. and a relative humidity of 65%.
Coefficient of dynamic friction (FMμd or FFμd) = 0.733log [W / (W−m)]
However, W and m shall be shown below.
W: Initial load applied to both ends of the fiber [mgf or N]
m: Reading of torsion traverse [mgf or N]
(3) In the card process under the conditions of an antistatic temperature of 30 ° C. and a relative humidity of 40%, the charged potential [mV] of 10 cm on the web was measured and evaluated in the following three stages in the order of difficulty of charging.
1. Good: -500 mV to 0 mV Somewhat bad: -1000mV or more and less than -500mV Defects: Less than -1000mV (4) Presence / absence of nep In the card process under the conditions of temperature 30 ° C and relative humidity 40%, the presence or absence of entangled small clumps (nep) in the web is visually measured. The evaluation was made in the following four steps in ascending order of mass.
1. Very good Good 3. Somewhat bad 4. Defective (5) In the drawing process under conditions of scum adhesion temperature of 25 ° C and relative humidity of 65%, 80 kg of spinning 300 gelen / 6 yards card sliver is passed through, and the fallen material on the rubber roller is collected and measured. Then, the evaluation was made in the following four steps in ascending order of the weight [mg].
1. Very good: less than 100 mg Good: 100 mg or more and less than 200 mg Slightly poor: 200 mg or more and less than 300 mg Defective: 300 mg or more (6) In the drawing process under conditions of 25 ° C and relative humidity of 65%, the spinning 300 gelen / 6 yards card sliver is passed into the drawing machine when passed through the drawing machine. The stretched sliver length [yard] was measured and evaluated in the following four steps in descending order of length.
1. Very good: 1200 yards or more Good: 1100 yards or more and less than 1200 yards Slightly poor: 1000 yards or more and less than 1100 yards Defective: Less than 1000 yards (7) In a drawing process under the conditions of a rolled cotton amount temperature of 25 ° C. and a relative humidity of 65%, a draft is drawn when 10 kg of a 300 selenium / 6 yard card sliver is passed through a drawing machine. The amount of cotton [mg] rolled up on the upper part of the roller was measured and evaluated in four stages in ascending order.
1. Very good: less than 100 mg Good: 100 mg or more and less than 200 mg Slightly poor: 200 mg or more and less than 300 mg Defect: 300 mg or more (8) Roller winding temperature of 25 ° C. and relative humidity of 65% In the roving process (60 spindles), when a sliver 1.5 ton was passed through the roving machine, it was wound around the rubber roller The number of times [times / 1.5 tons] was measured and evaluated in the following four steps in ascending order.
1. Very good: less than once 2. Good: 1 or more and less than 3 3. Slightly poor: 3 times or more and less than 10 times 4. Defect: 10 or more times Examples 1-5, Comparative Examples 1-6
After applying the crimping degree and the number of crimps shown in Table 1 to PPS tow (single fiber fineness: 2 denier), 0.2% by weight of the oil agent shown in Table 1 was given to the fiber by a spray method, and the thickness was adjusted to 51 mm. The PPS short fiber was obtained by cutting. This PPS short fiber is passed through the blended cotton, card, and kneading processes, the number of crimps and the degree of crimp, the coefficient of friction between metal fibers and between fibers, anti-static property, the presence or absence of nep, scum adhesion, roller Winding, cans capacity and wound cotton were measured. The results are shown in Table 2.
[0024]
As a result, the PPS short fibers of the present invention all had good spinnability without causing roller winding, generation of scum and nep, poor sliver coiling, etc., but the PPS short fibers of the comparative examples were spinnable. It was bad.
[0025]
[Table 1]

[0026]
[Table 2]

[0027]
【The invention's effect】
According to the present invention, it is possible to provide a PPS short fiber having high quality and good spinnability.

Claims (3)

(A) Phosphoric ester potassium salt having a saturated aliphatic hydrocarbon group having an average carbon number of 16 to 22 is 50 to 70% by weight, (b) 10 to 20% by weight of paraffin wax, (c) a cationic surfactant and / or Or an oily agent comprising 10 to 15% by weight of an anionic surfactant and (d) 4 to 15% by weight of a component represented by the general formula [I] and / or [II]. Polyphenylene sulfide short fiber.

Here, R ₁ represents an aliphatic hydrocarbon group having 10 to 14 carbon atoms, l and m represent the number of added moles of an oxyethylene group, and l + m = 5 to 15.

However, R ₂ is an aliphatic hydrocarbon group having 8 to 10 carbon atoms, n represents respectively the molar number of addition of oxyethylene group, an n = 5 to 10. The polyphenylene sulfide short fiber according to claim 1, wherein the degree of crimp of the fiber is 10 to 23%, and the number of crimps is 6 to 18 crests / 25 mm. The polyphenylene sulfide short fiber according to claim 1 or 2, wherein the amount of the oil agent attached to the fiber is 0.01 to 10% by weight relative to the fiber weight.